While critics railed against Lance Armstrong for coming off as detached in the two-part interview with Oprah Winfrey that aired Thursday and Friday nights, former teammate and friend, Tyler Hamilton, told "Good Morning America" today that he felt Armstrong was displaying "genuine emotion."

"I've never seen Lance shed a tear until last night. Before I even heard one word from him Thursday night, I could tell he was a broken man," Hamilton said.

Armstrong's contrition turned tearful Friday when he revealed to Oprah Winfrey how difficult it was to betray his family -- particularly his 13 year old son -- who stood up for the fallen cycling star as rumors swirled that he was taking banned drugs.

Armstrong, 41, choked up when he recounted what he told his son, Luke, in the wake of the scandal.

Armstrong was stripped of his seven Tour de France titles in October 2012, after a report by the U.S. Anti-Doping Agency found that he and 11 of his teammates orchestrated "the most sophisticated, professionalized and successful doping program that sport has ever seen."

Despite the admissions of his teammates that they had doped with Armstrong and seen him complete blood transfusions for races, Armstrong condemned the report and denied that he had ever cheated.

As sponsors including Nike began to pull support of Armstrong following the report, Armstrong's carefully-built image began to crumble. He stepped down from Livestrong, the charity he started to help cancer patients after he survived testicular cancer.

"It was a mythic perfect story and it wasn't true," Armstrong said of his fairytale story of overcoming testicular cancer to become the most celebrated cyclist in history.

In the interview, Armstrong explained his competition "cocktail" of EPO, blood transfusions and testosterone that he used throughout his career. He also said he had previously used cortisone.

Armstrong refused to give Winfrey the details of when, where and with whom he doped during seven winning Tours de France between 1999 and 2005, which was the last year he said he doped. Armstrong specifically denied using banned substances when he placed third in 2009 and entered the tour again in 2010.

They said that Armstrong's blood values at the 2009 race showed clear blood manipulation consistent with two transfusions. Armstrong's red blood cell count suddenly went up at these points, even though the number of baby red blood cells did not.

Federal authorities looking to prosecute criminal cases will look back at the "last overt act" in which the crime was committed, they explained. If Armstrong doped in 2005 but not 2009, the statute of limitations may have expired on potential criminal activity.

The sources noted that there is no evidence right now that a criminal investigation will be reopened. Armstrong is facing at least three civil suits.